Toy building block



FIG. 1 is a perspective view showing the front and right side and top ofthe toy building block showing my design;

FIG. 2 is a front view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a rear view thereof; and,

FIG. 5 is a bottom view thereof.

The ornamental design for a toy building block, as shown.